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27 February, 16:27

Consider the classes below:

public class TestA

{

public static void main (String args[])

{

int x = 2;

int y = 20

int counter = 0;

for (int j = y % x; j < 100; j + = (y / x))

counter++;

}

}

public class TestB

{ public static void main (String args[]) { int counter = 0; for (int j = 10; j > 0; - -j) + +counter; }}

Which of the following statements is true? a. The value of counter will be different at the end of each for loop for each class. b. The value of j will be the same for each loop for all iterationsc. Both (a) and (b) are true. d. Neither (a) nor (b) is true

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Answers (1)
  1. 27 February, 19:33
    0
    Hi!

    The correct answer is d. Neither (a) nor (b) is true.

    Explanation:

    First, you have to know what the scripts intend to do, and they are counting from 1 to 10 in both cases.

    Table of results of class TestA at end of each iteration:

    [j = 0, counter = 1]

    [j = 10, counter = 2]

    [j = 20, counter = 3]

    [j = 30, counter = 4]

    [j = 40, counter = 5]

    [j = 50, counter = 6]

    [j = 60, counter = 7]

    [j = 70, counter = 8]

    [j = 80, counter = 9]

    [j = 90, counter = 10]

    Table of results of class TestB at end of each iteration:

    [j = 10, counter = 1]

    [j = 9, counter = 2]

    [j = 8, counter = 3]

    [j = 7, counter = 4]

    [j = 6, counter = 5]

    [j = 5, counter = 6]

    [j = 4, counter = 7]

    [j = 3, counter = 8]

    [j = 2, counter = 9]

    [j = 1, counter = 10]

    That's why a) and b) are false.

    Maybe you want to know why using pre increments on class TestB doesn't affect the loop. The reason is that when enters in a loop, first checks the test condition and takes the decision if true or false, and last executes the incrementation step.
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